Might as well explain the ratings ...
1 for story as it had no story. While Aria the Natural had a different story every episode, this one has none. It's easier to add those mini-stories to Aria because of it's sci-fi elements. Adding that to a bunch of students' everyday life is hard.
9 for art because i loved it. Again, similarities to Aria can be seen.
10 for sound. The ED songs are made by Makino Yui, the same voice actress who made the OP songs for Aria. Great, calming music. The OP songs of Sketchbook were so good that i decided not to skip the opening sequence (i usually do).
9 for character - THERE ARE TALKING CATS HERE !! Yes, that's right, talking cats.
Anyways, this one is rated so high because the variety of characters in the art club is rather wide. They are all unique (except Ryou and Fuu who seem like the same person :P). And of course the cats, can't forget the cats.
I won't be doing any in-depth character analysis, you will see more about them when you watch it.
10 for enjoyment since there is no other option here. I'm a solid fan of the slice of life genre, watching these series is truly relaxing, especially after a hard day at work.
9.5 Overall. I'm not counting the story part in here. Sketchbook is highly recommended to slice of life fans. It won't disappoint you :)
I hope this review turns out helpful to at least one person, that'd make my efforts worthwhile ..
